Is it possible after d4 to play c6 and go into the caro-kann or the slav defence?
or is there an other option for white which makes c6 bad?
Well, if you play 1...d5 and 2...c6, White doesn't have the option of going into the Caro-Kann. Perhaps there is some line after 1.d4 c6 2.Nf3 d5 where ...c6 is a bit more passive than you would normally play, but I can't see one right now.
I think it's ok, but don't see why you would prefer it over 1...d5, giving White fewer options.
If you know both the Slav and the Caro but are more comfortable playing the Caro then perhaps this makes sense, since it might tempt White to transpose. I don't see anything better for White than to enter one of those two lines.
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